SN-A-C Orange
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I will opine pitch counts are not equal.If everything is accurate at the Vandy stats page below, then here are his outings with the highest pitch counts:
...
Some pitches put more stress on 'the arm' than other pitches.
Simple illustration is the longevity of the arm of Phil Niekro ... his pitch (while incredibly hard to master) was very easy on the arm.
Depending on who you listen to ... screwball, splitfinger fastball, or slider are the most stressful on 'the arm'. But do not be too quick to argue for or against the curveball. See last article listed.
Note: There is a reason that coaches call the pitches vs the pitcher or the catcher. So, coaches do 'own' responsibility for the pitchers arm - when the bench is calling the pitches.
Personally, I want excellent location AND movement on the fastball. Those are career building traits. (...this from a former catcher... so take it with a grain of salt.)
Research, if you are interested: [I focused on biomechanics, kinematics, and kinetics]
Advanced Biomechanics of the Pitching Delivery (Undated, but later than 2009) There is a discussion on 'Inverted W' and the increased risk of arm injury and reduced velocity caused by this mechanic.
Major League Baseball pitch velocity and pitch type associated with risk of ulnar collateral ligament injury - PubMed (2017 MLB): Who is likely at risk for ucl injury? (Unfortunately they did not separate fastballs into groups... perhaps this was an oversight. But I am a skeptic!)
Fastballs vs. Offspeed Pitches - Comparative and Relative Elbow Stress (2017) Great overall discussion